I've been using Logic 9 for about a year now and all is pretty well except now that I'm starting to do vocals I've noticed that my vocal track is out of sync with everything else that's going on. I do have other audio tracks that are fine, it's just that the vocals are off by say half a second. I went through all the preference settings and made sure everything is correct to record. Im using a UA tube preamp into a Motu 828 interface. It goes in fine but when played back its off. Any information on how to correct this would greatly appreciated.